Average Maturity of Debt Securities

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- Definition

Number of Locations with Pricing Differences

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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- Definition

Amount of gain (loss) realized from securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

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Fair Value (Details Textuals)	3 Months Ended		9 Months Ended		12 Months Ended
Fair Value (Details Textuals)	Sep. 30, 2016 USD ($) location	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) location	Sep. 30, 2015 USD ($)	Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]
Number of locations \| location	2		2
Trading securities realized gain (loss)			$ 15,000,000	$ (2,000,000)
Nuclear decommissioning trust fund \| DTE Electric
Fair Value, Option, Quantitative Disclosures [Line Items]
Average maturity of debt securities (in years)			7 years		6 years
Accumulated Net Unrealized Investment Gain (Loss)
Fair Value, Option, Quantitative Disclosures [Line Items]
Unrealized losses on available for sale securities	$ 0	$ 0	$ 0	0
Accumulated Net Unrealized Investment Gain (Loss) \| DTE Electric
Fair Value, Option, Quantitative Disclosures [Line Items]
Unrealized losses on available for sale securities	$ 0	$ 0	$ 0	$ 0